/*
 * Copyright [2013-2021], Alibaba Group Holding Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.alibaba.polardbx.gms.node;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;

import javax.annotation.concurrent.Immutable;
import java.util.Objects;

import static java.util.Objects.requireNonNull;

@Immutable
public class NodeVersion {
    public static final NodeVersion UNKNOWN = new NodeVersion("<unknown>");

    private final String version;

    @JsonCreator
    public NodeVersion(@JsonProperty("version") String version) {
        this.version = requireNonNull(version, "version is null");
    }

    @JsonProperty
    public String getVersion() {
        return version;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        NodeVersion that = (NodeVersion) o;
        return Objects.equals(version, that.version);
    }

    @Override
    public int hashCode() {
        if (version == null) {
            return 31;
        } else {
            return 31 + version.hashCode();
        }
    }

    @Override
    public String toString() {
        return version;
    }
}
